update showcase with Gatsby Manor (#3959)

Gatsby Manor makes themes for GatsbyJS.
gatsbyjs · Feb 10, 2018 · c0aa167 · c0aa167
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diff --git a/README.md b/README.md
@@ -157,6 +157,7 @@ Websites built with Gatsby:
 * [Ventura Digitalagentur Köln](https://www.ventura-digital.de)
 * [Cardiogram](https://cardiogr.am/)
 * [LaserTime Clinic](https://lasertime.ru) ([source](https://github.com/oleglegun/lasertime))
+* [Gatsby Manor - themes for GatsbyJS](https://gatsbymanor.com)
 
 ## Docs